Optical imaging lens system, image capturing unit and electronic device

ABSTRACT

An optical imaging lens system includes five lens elements which are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element has negative refractive power. The third lens element has positive refractive power. The fourth lens element has negative refractive power. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof.

RELATED APPLICATIONS

This application is a continuation patent application of U.S.application Ser. No. 16/709,772, filed on Dec. 10, 2019, which is acontinuation patent application of U.S. application Ser. No. 15/707,861,filed on Sep. 18, 2017, which claims priority to Taiwan Application106111311, filed Mar. 31, 2017, which is incorporated by referenceherein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to an optical imaging lens system, animage capturing unit and an electronic device, more particularly to anoptical imaging lens system and an image capturing unit applicable to anelectronic device.

Description of Related Art

In recent years, with the popularity of electronic devices having camerafunctionalities, the demand of miniaturized optical systems has beenincreasing. As the advanced semiconductor manufacturing technologieshave reduced the pixel size of sensors, the compact optical systems havegradually evolved toward the field of higher megapixels. Since there isan increasing demand for the electronic devices featuring compactnessand better imaging functionality, the compact optical systems featuringhigh image quality have become the mainstream product in the market.

With the increasing applications of optical systems, the productspecifications are becoming more stringent. In the conventional opticalsystem having small field of view and telephoto effect, it is difficultto miniaturize the size of the optical system due to the limitedmaterials as well as the changes of the shape of the lens; in addition,it is difficult to obtain a balance between the improvement ofassembling process and sensitivity. Therefore, an optical system havingfeatures of telephoto effect, miniaturized size, easy to assemble andhigh image quality is able to meet the requirements of the market in thefuture.

As a result, there is a need to develop an optical system with a properarrangement of optical elements to achieve features of telephoto effect,miniaturized size, assembling convenience and high image quality, forvarious applications, such as intelligent electronic products,multi-lens devices, wearable devices, digital cameras, automotivedevices, identification systems, entertainment devices, sports devicesand home intelligent assistance systems.

SUMMARY

According to one aspect of the present disclosure, an optical imaginglens system includes five lens elements which are, in order from anobject side to an image side, a first lens element, a second lenselement, a third lens element, a fourth lens element and a fifth lenselement. The first lens element has positive refractive power. Thesecond lens element has negative refractive power. The third lenselement has positive refractive power. The fourth lens element hasnegative refractive power. The fifth lens element has negativerefractive power. When a central thickness of the fifth lens element isCT5, a refractive power of the second lens element is P2, a refractivepower of the fourth lens element is P4, a refractive power of the fifthlens element is P5, an axial distance between the first lens element andthe second lens element is T12, an axial distance between the secondlens element and the third lens element is T23, an axial distancebetween the third lens element and the fourth lens element is T34, acurvature radius of an object-side surface of the fifth lens element isR9, and a curvature radius of an image-side surface of the fifth lenselement is R10, the following conditions are satisfied:0.05<CT5/T23<3.80;P2+P4+P5<−3.20;1.10<(P2+P4+P5)/P4<9.0;0.60<T34/T12<6.0; and0.15<|(R9+R10)/(R9−R10)|<5.80.

According to another aspect of the present disclosure, an imagecapturing unit includes the aforementioned optical imaging lens systemand an image sensor, wherein the image sensor is disposed on an imagesurface of the optical imaging lens system.

According to still another aspect of the present disclosure, anelectronic device includes the aforementioned image capturing unit.

According to yet another aspect of the present disclosure, an opticalimaging lens system includes five lens elements which are, in order froman object side to an image side, a first lens element, a second lenselement, a third lens element, a fourth lens element and a fifth lenselement. The first lens element has positive refractive power. Thesecond lens element has negative refractive power. The third lenselement has positive refractive power. The fourth lens element hasnegative refractive power. The fifth lens element has negativerefractive power. The optical imaging lens system further includes anaperture stop. When a central thickness of the fourth lens element isCT4, a central thickness of the fifth lens element is CT5, a refractivepower of the second lens element is P2, a refractive power of the fourthlens element is P4, a refractive power of the fifth lens element is P5,an axial distance between the second lens element and the third lenselement is T23, an axial distance between the third lens element and thefourth lens element is T34, an axial distance between the aperture stopand an object-side surface of the third lens element is DsR5, and anaxial distance between the aperture stop and an image-side surface ofthe third lens element is DsR6, the following conditions are satisfied:0.10<CT5/T23<3.0;P2+P4+P5<−3.35;0.65<CT4/T34<9.0; and0<|DsR5/DsR6|<1.0.

According to yet still another aspect of the present disclosure, anoptical imaging lens system includes five lens elements which are, inorder from an object side to an image side, a first lens element, asecond lens element, a third lens element, a fourth lens element and afifth lens element. The first lens element has positive refractivepower. The second lens element has negative refractive power. The thirdlens element has positive refractive power. The fourth lens element hasnegative refractive power. The fifth lens element with negativerefractive power has an object-side surface being concave in a paraxialregion thereof. When a central thickness of the fifth lens element isCT5, an axial distance between the second lens element and the thirdlens element is T23, an Abbe number of the third lens element is V3, afocal length of the optical imaging lens system is f, a curvature radiusof an object-side surface of the third lens element is R5, and acurvature radius of an image-side surface of the third lens element isR6, the following conditions are satisfied:0.05<CT5/T23<3.80;10.0<V3<25.0; and−10.0<[(R5−R6)*f]/(R5*R6)<−1.70.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 a schematic view of an image capturing unit according to the 7thembodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 a schematic view of an image capturing unit according to the 8thembodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 a schematic view of an image capturing unit according to the 9thembodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 a schematic view of an image capturing unit according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 10thembodiment;

FIG. 21 a schematic view of an image capturing unit according to the11th embodiment of the present disclosure;

FIG. 22 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 11thembodiment;

FIG. 23 a schematic view of an image capturing unit according to the12th embodiment of the present disclosure;

FIG. 24 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 12thembodiment;

FIG. 25 is a perspective view of an image capturing unit according tothe 13th embodiment of the present disclosure;

FIG. 26 is a perspective view of an electronic device according to the14th embodiment of the present disclosure;

FIG. 27 is another perspective view of the electronic device in FIG. 26;

FIG. 28 is a block diagram of the electronic device in FIG. 26 ;

FIG. 29 is a schematic view of inflection point on the fourth lenselement according to the 2nd embodiment of the present disclosure;

FIG. 30 is a schematic view of a reflector in the optical imaging lenssystem according to one embodiment of the present disclosure;

FIG. 31 is a schematic view of another reflector in the optical imaginglens system according to another embodiment of the present disclosure;and

FIG. 32 is a schematic view of an optical imaging lens system with areflector in an electronic device according to still another embodimentof the present disclosure.

DETAILED DESCRIPTION

An optical imaging lens system includes five lens elements. The fivelens elements are, in order from an object side to an image side, afirst lens element, a second lens element, a third lens element, afourth lens element and a fifth lens element.

There is an air gap in a paraxial region between every two of the fivelens elements of the optical imaging lens system that are adjacent toeach other; that is, each of the first through the fifth lens elementscan be a single and non-cemented lens element. The manufacturing processof the cemented lenses is more complex than the non-cemented lenses, forinstance, an image-side surface of one lens element and an object-sidesurface of the following lens element need to have accurate curvature toensure these two lens elements to be highly cemented. However, duringthe cementing process, those two lens elements might not be highlycemented due to displacement and it is thereby not favorable for theimage quality.

Therefore, there can be an air gap in a paraxial region between each ofthe five adjacent lens elements in the present disclosure for solvingthe problem generated by the cemented lens elements.

The first lens element has positive refractive power. Therefore, it isfavorable for providing sufficient light convergence to obtain atelephoto effect so as to reduce a total track length and miniaturizethe size of the optical imaging lens system.

The second lens element has negative refractive power. Therefore, it isfavorable for balancing the positive refractive power of the first lenselement as well as correcting chromatic aberration.

The third lens element has positive refractive power. Therefore, it isfavorable for cooperating with the first lens element to properlydistribute the positive refractive power, thereby reducing thesensitivity of the optical imaging lens system.

The fourth lens element has negative refractive power. Therefore, it isfavorable for balancing the positive refractive power of the third lenselement as well as correcting aberrations of the optical imaging lenssystem at the image side. In addition, either an object-side surface ofthe fourth lens element, an image-side surface of the fourth lenselement or both the object-side surface and the image-side surface ofthe fourth lens element can have at least one inflection point;therefore, the shape of the fourth lens element is favorable forcorrecting off-axial aberrations at the image side, thereby improvingimage quality. Please refer to FIG. 29 , which is a schematic view ofinflection point on the fourth lens element according to the 2ndembodiment of the present disclosure. In FIG. 29 , the object-sidesurface and the image-side surface of the fourth lens element both haveat least one inflection point P.

The fifth lens element has negative refractive power; therefore, it isfavorable for correcting astigmatism and obtaining a proper angle ofincidence at the image surface so as to improve image quality at theperiphery of the image. In addition, the fifth lens element can have anobject-side surface being concave in a paraxial region thereof;therefore, it is favorable for designing the shape of the object-sidesurface of the fifth lens element so as to correct aberrations andmaintain image quality. Furthermore, either the object-side surface ofthe fifth lens element, an image-side surface of the fifth lens elementor both the object-side surface and the image-side surface of the fifthlens element can have at least one inflection point; therefore, it isfavorable for adjusting the shape of the fifth lens element to captureperipheral light rays so as to prevent stray light due to large incidentangle; also, it is favorable for controlling the angle of incidence atthe image surface so as to maintain the brightness of the image, therebyimproving the image quality.

When a central thickness of the fifth lens element is CT5, and an axialdistance between the second lens element and the third lens element isT23, the following condition is satisfied: 0.05<CT5/T23<3.80. Therefore,it is favorable for obtaining a proper central thickness of the fifthlens element and adjusting a ratio of the central thickness of the fifthlens element to the axial distance between the second lens element andthe third lens element so as to miniaturize the optical imaging lenssystem and provide space for accommodating additional opto-mechanicalcomponents between the second lens element and the third lens element,thereby improving the image quality. Preferably, the following conditioncan also be satisfied: 0.10<CT5/T23<3.0.

When a refractive power of the second lens element is P2, a refractivepower of the fourth lens element is P4, and a refractive power of thefifth lens element is P5, the following condition can be satisfied:P2+P4+P5<−3.20. Therefore, it is favorable for adjusting thedistribution of the refractive power of the lens elements havingnegative refractive power to achieve telephoto effect, such that theoptical imaging lens system is applicable to various electronic devices.Preferably, the following condition can also be satisfied:P2+P4+P5<−3.35. Specifically, P2 is a ratio of a focal length of theoptical imaging lens system to a focal length of the second lenselement, P4 is a ratio of the focal length of the optical imaging lenssystem to a focal length of the fourth lens element, and P5 is a ratioof the focal length of the optical imaging lens system to a focal lengthof the fifth lens element.

When the refractive power of the second lens element is P2, therefractive power of the fourth lens element is P4, and the refractivepower of the fifth lens element is P5, the following condition can besatisfied: 1.10<(P2+P4+P5)/P4<9.0. Therefore, it is favorable foradjusting the distribution of the refractive power of the lens elementshaving negative refractive power so as to reduce the sensitivity of theoptical imaging lens system and correct aberrations. Preferably, thefollowing condition can also be satisfied: 1.50<(P2+P4+P5)/P4<8.50.

When an axial distance between the first lens element and the secondlens element is T12, and an axial distance between the third lenselement and the fourth lens element is T34, the following condition canbe satisfied: 0.60<T34/T12<6.0. Therefore, it is favorable forcontrolling the ratio of the axial distances between each adjacent lenselement so as to obtain a small field of view and sufficiently strongrefractive power; also, it is favorable for maintaining assembly yieldrate. Preferably, the following condition can also be satisfied:0.75<T34/T12<5.80.

When a curvature radius of the object-side surface of the fifth lenselement is R9, and a curvature radius of the image-side surface of thefifth lens element is R10, the following condition can be satisfied:0.15<|(R9+R10)/(R9−R10)|<5.80. Therefore, it is favorable for adjustingthe shapes of the surfaces of the fifth lens element so as to maintainthe refractive power of the fifth lens element and provide a sufficientback focal length to increase design flexibility. Preferably, thefollowing condition can also be satisfied: 0.20<|(R9+R10)/(R9−R10)|<5.0.

When a central thickness of the fourth lens element is CT4, and theaxial distance between the third lens element and the fourth lenselement is T34, the following condition can be satisfied:0.65<CT4/T34<9.0. Therefore, it is favorable for obtaining a propercentral thickness of the fourth lens element and adjusting a ratio ofthe central thickness of the fourth lens element to the axial distancebetween the third lens element and the fourth lens element, so as toimprove the lens molding and the assembly yield rate, thereby improvingthe image quality. Preferably, the following condition can also besatisfied: 0.65<CT4/T34<4.80. More preferably, the following conditioncan also be satisfied: 0.70<CT4/T34<4.0.

The optical imaging lens system further includes an aperture stop. Whenan axial distance between the aperture stop and an object-side surfaceof the third lens element is DsR5, and an axial distance between theaperture stop and an image-side surface of the third lens element isDsR6, the following condition can be satisfied: 0<|DsR5/DsR6|<1.0.Therefore, it is favorable for controlling the position of the aperturestop to achieve telephoto effect, thereby improving the image-sensingefficiency of an image sensor.

When an Abbe number of the third lens element is V3, the followingcondition can be satisfied: 10.0<V3<25.0. Therefore, the third lenselement is made of high dispersion material (low Abbe number) so thatthe density difference between the interface of the third lens elementand the air is large, and thus it is favorable for increasing the angleof refraction at the interface so as to generate the same refractiveeffect in a smaller space, thereby miniaturizing the optical imaginglens system.

When a focal length of the optical imaging lens system is f, a curvatureradius of the object-side surface of the third lens element is R5, and acurvature radius of the image-side surface of the third lens element isR6, the following condition can be satisfied:−10.0<[(R5−R6)*f]/(R5*R6)<−1.70. Therefore, it is favorable forcontrolling the shapes of the surfaces of the third lens element so asto get a proper refractive power of the third lens element, therebyshortening the total track length of the optical imaging lens system formaintaining compactness.

When a curvature radius of the image-side surface of the fourth lenselement is R8, and a curvature radius of the object-side surface of thefifth lens element is R9, the following condition can be satisfied:|R9/R8|<12.0. Therefore, it is favorable for adjusting the arrangementof the curvatures of the image-side surface of the fourth lens elementand the object-side surface of the fifth lens element so as to get astructure having small field of view, thereby achieving telephotoeffect. Preferably, the following condition can also be satisfied:|R9/R8|<9.0. More preferably, the following condition can also besatisfied: |R9/R8|<4.5.

When the axial distance between the second lens element and the thirdlens element is T23, and the axial distance between the fourth lenselement and the fifth lens element is T45, the following condition canbe satisfied: −0.35<(T23−T45)/(T23+T45)<0.50. Therefore, it is favorablefor arranging the ratio of the axial distance at the object side to theaxial distance at the image side so as to improve the symmetry of theoptical imaging lens system and reduce the sensitivity.

When a maximum effective radius of the image-side surface of the fifthlens element is Y52, and an entrance pupil diameter of the opticalimaging lens system is EPD, the following condition can be satisfied:0.70<Y52*2/EPD<1.20. Therefore, it is favorable for controlling theratio between the effective radius of the image-side surface of thefifth lens element to the entrance pupil diameter so as to miniaturizethe optical imaging lens system and ensure the brightness beingsufficient enough for telephoto, thereby increasing the range ofapplication.

When a maximum effective radius among all surfaces of the five lenselements of the optical imaging lens system is Ymax, the followingcondition can be satisfied: 0.70 [mm]<Ymax<5.0 [mm]. Therefore, it isfavorable for controlling the maximum effective radius of each lenselement so as to maintain the compactness of the optical imaging lenssystem for being adapted to various compact electronic devices.Preferably, the following condition can also be satisfied: 1.0[mm]<Ymax<3.0 [mm].

When an axial distance between an object-side surface of the first lenselement and an image surface is TL, and the focal length of the opticalimaging lens system is f, the following condition can be satisfied:0.70<TL/f<1.10. Therefore, it is favorable for controlling the totaltrack length and the focal length of the optical imaging lens system soas to obtain a balance between compactness and the telephoto effect.

When an axial distance between the image-side surface of the fifth lenselement and the image surface is BL, and a sum of axial distancesbetween every two of the five lens elements of the optical imaging lenssystem that are adjacent to each other is ΣAT, the following conditioncan be satisfied: 0.05<BL/ΣAT<4.0. Therefore, it is favorable forcontrolling the ratio between the back focal length to the axialdistances between each adjacent lens element so as to provide asufficient space for accommodating additional opto-mechanicalcomponents, thereby improving the image quality and assemblingconvenience. Preferably, the following condition can also be satisfied:0.70<BL/ΣAT<3.20.

According to the present disclosure, the aperture stop can be disposedbetween an object and the object-side surface of the third lens element.Therefore, it is favorable for controlling the position of the aperturestop to achieve the feature of telephoto effect so as to improve theimage-sensing efficiency of the image sensor.

When a maximum image height of the optical imaging lens system is ImgH(i.e. half of a diagonal length of an effective photosensitive area ofan image sensor), and the focal length of the optical imaging lenssystem is f, the following condition can be satisfied: 0.10<ImgH/f<0.50.Therefore, it is favorable for the optical imaging lens system to obtaina telephoto effect so as to be applicable to various types ofphotography

When an Abbe number of the second lens element is V2, and an Abbe numberof the fourth lens element is V4, the following condition can besatisfied: 0<(V2+V4)/2<25.0. Therefore, it is favorable for converginglight rays that have different wavelengths so as to prevent imageoverlap.

When the axial distance between the second lens element and the thirdlens element can be larger than both the axial distance between thefirst lens element and the second lens element and the axial distancebetween the third lens element and the fourth lens element (i.e.,T23>T12 and T23>T34), and an axial distance between the fourth lenselement and the fifth lens element can be larger than both the axialdistance between the first lens element and the second lens element andthe axial distance between the third lens element and the fourth lenselement (i.e., T45>T12 and T45>T34). Therefore, it is favorable forcontrolling the axial distances between the adjacent lens elements atboth the image side and the object side so as to get a structure havingsmall field of view, thereby improving the assembly yield rate and theimage quality.

When the focal length of the optical imaging lens system is f, a focallength of the third lens element is f3, the following condition can besatisfied: 1.0<f/f3<5.0. Therefore, it is favorable for strengtheningthe refractive power of the third lens element and moving the principlepoint of the optical imaging lens system toward the image side so as toprovide a sufficient back focal length to increase the designflexibility.

When a maximum effective radius of the object-side surface of the firstlens element is Y11, and the maximum effective radius of the image-sidesurface of the fifth lens element is Y52, the following condition can besatisfied: 0.70<Y52/Y11<1.10. Therefore, it is favorable for obtaining aproper ratio of the effective radius of the lens element at the objectside to the effective radius of the lens element at the image side. As aresult, the outer diameter of the lens can be controlled so as to reducethe outer diameter of the lens barrel, thereby improving the designflexibility.

When the axial distance between the image-side surface of the fifth lenselement and the image surface is BL, the axial distance between thesecond lens element and the third lens element is T23, and the sum ofaxial distances between every two of the five lens elements of theoptical imaging lens system that are adjacent to each other is ΣAT, thefollowing condition can be satisfied: 0.30 ΣAT/(T23+BL)<0.75. Therefore,it is favorable for adjusting the ratio of the axial distances betweenthe adjacent lens elements to the back focal length of the opticalimaging lens system and increasing the assembly yield rate; in addition,it is also favorable for adding various opto-mechanical components toincrease the design flexibility, thereby being adapted to variouselectronic devices.

When the Abbe number of the second lens element is V2, the Abbe numberof the third lens element is V3, and the Abbe number of the fourth lenselement is V4, the following condition can be satisfied:30.0<V2+V3+V4<95.0. Therefore, it is favorable for selecting materialsof the lens elements so as to strengthening the refractive power of thelens elements to achieve telephoto effect and correct variousaberrations.

When half of a maximum field of view of the optical imaging lens systemis HFOV, the following condition can be satisfied: tan(HFOV)<0.30.Therefore, it is favorable for meeting the requirements of small fieldof view and telephoto effect, simultaneously.

When an axial distance between the aperture stop and the image-sidesurface of the fifth lens element is SD, and an axial distance betweenthe object-side surface of the first lens element and the image-sidesurface of the fifth lens element is TD, the following condition can besatisfied: 0.70<SD/TD<1.0. Therefore, it is favorable for adjusting theposition of the aperture stop so that there is a sufficient distancebetween an exit pupil of the optical imaging lens system and the imagesurface so as to achieve telecentric effect.

When the sum of axial distances between every two of the five lenselements of the optical imaging lens system that are adjacent to eachother is ΣAT, and the central thickness of the third lens element isCT3, the following condition can be satisfied: 0.10<ΣAT/CT3<7.50.Therefore, it is favorable for obtaining a proper ratio of the centralthickness of the third lens element to the axial distances between eachadjacent lens element of the optical imaging lens system so as tostrengthen the refractive power of the third lens element and reduce thesensitivity. As a result, the total track length is reduced and theoptical imaging lens system is miniaturized.

According to the present disclosure, the optical imaging lens system caninclude at least one reflector. The reflector is favorable for changingthe direction of light rays so as to improve space usage, so that theoptical imaging lens system can be more flexible to design. Please referto FIG. 30 , which is a schematic view of a reflector in the opticalimaging lens system according to one embodiment of the presentdisclosure. In FIG. 30 , the reflector is a prism R1 disposed between animaged object (not shown) and the optical imaging lens system (notnumbered). However, the present disclosure is not limited to thequantity and position of the prism R1 in FIG. 30 . Please refer to FIG.31 , which is a schematic view of another reflector in the opticalimaging lens system according to another embodiment of the presentdisclosure. In FIG. 31 , the reflector is a reflective mirror R2. Then,please refer to FIG. 32 , which is a schematic view of an opticalimaging lens system with a reflector in an electronic device accordingto still another embodiment of the present disclosure. As shown in FIG.32 , the direction of light rays can be changed by the reflector (prismR1) so that the total track length is prevented from being too long.

According to the present disclosure, the lens elements of the opticalimaging lens system can be made of glass or plastic material. When thelens elements are made of glass material, the distribution of therefractive power of the optical imaging lens system may be more flexibleto design. When the lens elements are made of plastic material,manufacturing costs can be effectively reduced. Furthermore, surfaces ofeach lens element can be arranged to be aspheric, since the asphericsurface of the lens element is easy to form a shape other than aspherical surface so as to have more controllable variables foreliminating aberrations thereof and to further decrease the requirednumber of the lens elements. Therefore, the total track length of theoptical imaging lens system can also be reduced.

According to the present disclosure, in the optical imaging lens system,the inflection point on the surfaces of the lens element is the junctionbetween positive surface curvature and negative surface curvature.

According to the present disclosure, each of an object-side surface andan image-side surface of a lens element has a paraxial region and anoff-axial region. The paraxial region refers to the region of thesurface where light rays travel close to the optical axis, and theoff-axial region refers to the region of the surface away from theparaxial region. Particularly unless otherwise stated, when the lenselement has a convex surface, it indicates that the surface can beconvex in the paraxial region thereof; when the lens element has aconcave surface, it indicates that the surface can be concave in theparaxial region thereof. Moreover, when a region of refractive power orfocus of a lens element is not defined, it indicates that the region ofrefractive power or focus of the lens element can be in the paraxialregion thereof.

According to the present disclosure, an image correction unit, such as afield flattener, can be optionally disposed between the lens elements ofthe optical imaging lens system and the image surface for correction ofaberrations such as field curvature. The optical properties of the imagecorrection unit, such as curvature, thickness, index of refraction,position and surface shape (convex or concave surface with spherical,aspheric, diffraction or Fresnel morphology), can be adjusted accordingto the demand of an image capturing unit. In generally, a preferableimage correction unit is, for example, a thin transparent element havinga concave object-side surface and a planar image-side surface, and thethin transparent element is disposed near the image surface.

According to the present disclosure, an image surface of the opticalimaging lens system on a corresponding image sensor can be flat orcurved, particularly a concave curved surface facing towards the objectside of the optical imaging lens system.

According to the present disclosure, the optical imaging lens system caninclude at least one stop, such as an aperture stop, a glare stop or afield stop. Said glare stop or said field stop is allocated foreliminating the stray light and thereby improving image quality thereof.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between theobject and the first lens element can produce a telecentric effect byproviding a longer distance between an exit pupil and the image surface,thereby improving the image-sensing efficiency of an image sensor (forexample, CCD or CMOS). A middle stop disposed between the first lenselement and the image surface is favorable for enlarging the view angleand thereby provides a wider field of view.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 180. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 100, a first lens element 110, a second lens element 120, a thirdlens element 130, a fourth lens element 140, a fifth lens element 150, afilter 160 and an image surface 170. The optical imaging lens systemincludes five lens elements (110, 120, 130, 140 and 150) with noadditional lens element disposed between the first lens element 110 andthe fifth lens element 150.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material and has theobject-side surface 111 and the image-side surface 112 being bothaspheric.

The second lens element 120 with negative refractive power has anobject-side surface 121 being concave in a paraxial region thereof andan image-side surface 122 being concave in a paraxial region thereof.The second lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 with positive refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being concave in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric.

The fourth lens element 140 with negative refractive power has anobject-side surface 141 being convex in a paraxial region thereof and animage-side surface 142 being concave in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric. The object-side surface 141 of the fourth lens element 140 hasat least one inflection point.

The fifth lens element 150 with negative refractive power has anobject-side surface 151 being concave in a paraxial region thereof andan image-side surface 152 being convex in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric. The object-side surface 151 of the fifth lens element 150 hasat least one inflection point.

The filter 160 is made of glass material and located between the fifthlens element 150 and the image surface 170, and will not affect thefocal length of the optical imaging lens system. The image sensor 180 isdisposed on or near the image surface 170 of the optical imaging lenssystem.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:X(Y)=(Y ² /R)/(1+sqrt(1−(1+k)×(Y/R)²))+Σ_(i)(Ai)×(Y ^(i)),

-   -   where,    -   X is the relative distance between a point on the aspheric        surface spaced at a distance Y from an optical axis and the        tangential plane at the aspheric surface vertex on the optical        axis;    -   Y is the vertical distance from the point on the aspheric        surface to the optical axis;    -   R is the curvature radius;    -   k is the conic coefficient; and    -   Ai is the i-th aspheric coefficient, and in the embodiments, i        may be, but is not limited to, 4, 6, 8, 10, 12, 14 and 16.

In the optical imaging lens system of the image capturing unit accordingto the 1st embodiment, when a focal length of the optical imaging lenssystem is f, an f-number of the optical imaging lens system is Fno, andhalf of a maximum field of view of the optical imaging lens system isHFOV, these parameters have the following values: f=10.06 millimeters(mm); Fno=2.53; and HFOV=14.7 degrees (deg.).

When half of a maximum field of view of the optical imaging lens systemis HFOV, the following condition is satisfied: tan(HFOV)=0.26.

When an Abbe number of the third lens element 130 is V3, the followingcondition is satisfied: V3=20.3.

When an Abbe number of the second lens element 120 is V2, and an Abbenumber of the fourth lens element 140 is V4, the following condition issatisfied: (V2+V4)/2=20.37.

When the Abbe number of the second lens element 120 is V2, the Abbenumber of the third lens element 130 is V3, the Abbe number of thefourth lens element 140 is V4, the following condition is satisfied:V2+V3+V4=61.1.

When a central thickness of the fifth lens element 150 is CT5, and anaxial distance between the second lens element 120 and the third lenselement 130 is T23, the following condition is satisfied: CT5/T23=0.97.In this embodiment, an axial distance between each adjacent lens elementis the air gap in the axial direction therebetween.

When a central thickness of the fourth lens element 140 is CT4, and anaxial distance between the third lens element 130 and the fourth lenselement 140 is T34, the following condition is satisfied: CT4/T34=1.32.

When an axial distance between the first lens element 110 and the secondlens element 120 is T12, and the axial distance between the third lenselement 130 and the fourth lens element 140 is T34, the followingcondition is satisfied: T34/T12=2.06.

When the axial distance between the second lens element 120 and thethird lens element 130 is T23, and an axial distance between the fourthlens element 140 and the fifth lens element 150 is T45, the followingcondition is satisfied: (T23−T45)/(T23+T45)=−0.34.

When a sum of axial distances between every two of the five lenselements (110, 120, 130, 140 and 150) of the optical imaging lens systemthat are adjacent to each other is ΣAT, and a central thickness of thethird lens element 130 is CT3, the following condition is satisfied:ΣAT/CT3=2.03.

When the sum of axial distances between every two of the five lenselements (110, 120, 130, 140 and 150) of the optical imaging lens systemthat are adjacent to each other is ΣAT, the axial distance between thesecond lens element 120 and the third lens element 130 is T23, and anaxial distance between the image-side surface 152 of the fifth lenselement 150 and the image surface 170 is BL, the following condition issatisfied: ΣAT/(T23+BL)=0.59.

When the axial distance between the image-side surface 152 of the fifthlens element 150 and the image surface 170 is BL, and the sum of axialdistances between every two of the five lens elements (110, 120, 130,140 and 150) of the optical imaging lens system that are adjacent toeach other is ΣAT, the following condition is satisfied: BL/ΣAT=1.42.

When a curvature radius of the image-side surface 142 of the fourth lenselement 140 is R8, and a curvature radius of the object-side surface 151of the fifth lens element 150 is R9, the following condition issatisfied: |R9/R8|=0.52.

When the curvature radius of the object-side surface 151 of the fifthlens element 150 is R9, and a curvature radius of the image-side surface152 of the fifth lens element 150 is R10, the following condition issatisfied: |(R9+R10)/(R9−R10)|=3.71.

When the focal length of the optical imaging lens system is f, acurvature radius of the object-side surface 131 of the third lenselement 130 is R5, and a curvature radius of the image-side surface 132of the third lens element 130 is R6, the following condition issatisfied: [|(R5−R6)|*f]/(R5*R6)=−2.68.

When an axial distance between the aperture stop 100 and the image-sidesurface 152 of the fifth lens element 150 is SD, and an axial distancebetween the object-side surface 111 of the first lens element 110 andthe image-side surface 152 of the fifth lens element 150 is TD, thefollowing condition is satisfied: SD/TD=0.87.

When a maximum effective radius of the image-side surface 152 of thefifth lens element 150 is Y52, and an entrance pupil diameter of theoptical imaging lens system is EPD, the following condition issatisfied: Y52*2/EPD=0.97.

When a maximum effective radius of the object-side surface 111 of thefirst lens element 110 is Y11, and the maximum effective radius of theimage-side surface 152 of the fifth lens element 150 is Y52, thefollowing condition is satisfied: Y52/Y11=0.97.

When the focal length of the optical imaging lens system is f, a focallength of the third lens element 130 is f3, the following conditions aresatisfied: f/f3=1.86.

When a maximum image height of the optical imaging lens system is ImgH,and the focal length of the optical imaging lens system is f, thefollowing condition is satisfied: ImgH/f=0.27.

When an axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 170 is TL, and the focal lengthof the optical imaging lens system is f, the following condition issatisfied: TL/f=0.95.

When a refractive power of the second lens element 120 is P2, arefractive power of the fourth lens element 140 is P4, and a refractivepower of the fifth lens element 150 is P5, the following condition issatisfied: P2+P4+P5=−3.74.

When the refractive power of the second lens element 120 is P2, therefractive power of the fourth lens element 140 is P4, and therefractive power of the fifth lens element 150 is P5, the followingcondition is satisfied: (P2+P4+P5)/P4=4.71.

When an axial distance between the aperture stop 100 and the object-sidesurface 131 of the third lens element 130 is DsR5, and an axial distancebetween the aperture stop 100 and the image-side surface 132 of thethird lens element 130 is DsR6, the following condition is satisfied:|DsR5/DsR6|=0.60.

When a maximum effective radius among all surfaces of the five lenselements (110, 120, 130, 140 and 150) of the optical imaging lens systemis Ymax, the following condition is satisfied: Ymax=1.99 mm. In thisembodiment, the maximum effective radius of the object-side surface 111of the first lens element 110 is larger than the maximum effective radiiof the other object-side surfaces (121-151) and the image-side surfaces(112-152), and thus Ymax=Y11.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 10.06 mm, Fno = 2.53, HFOV = 14.7 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.808 2 Lens 1 2.680 (ASP)1.382 Plastic 1.545 56.1 4.98 3 166.667 (ASP) 0.151 4 Lens 2 −10.027(ASP) 0.350 Plastic 1.661 20.3 −4.37 5 4.107 (ASP) 0.619 6 Lens 3 2.809(ASP) 1.145 Plastic 1.661 20.3 5.40 7 11.097 (ASP) 0.311 8 Lens 4 25.535(ASP) 0.411 Plastic 1.660 20.4 −12.68 9 6.263 (ASP) 1.249 10 Lens 5−3.247 (ASP) 0.601 Plastic 1.535 56.3 −15.69 11 −5.639 (ASP) 2.299 12Filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 0.792 14 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 6 k =  6.8143E−02 9.9000E+01  1.8080E+01 −9.4425E+00 −4.4848E−01 A4 = −1.2797E−03 1.0353E−02  3.3283E−02  3.2409E−02 −2.1200E−02 A6 = −1.3782E−04−8.5238E−03 −1.5992E−02 −5.4476E−03  3.4993E−03 A8 = −6.7307E−05 5.8963E−03  1.0155E−02  4.5472E−03 −1.1536E−03 A10 = −1.1565E−04−2.3375E−03 −3.9903E−03 −1.2916E−03  1.3536E−03 A12 =  5.9405E−05 3.3548E−04  6.3680E−04 −1.5843E−04 −6.0121E−04 A14 = −1.0084E−05−1.0487E−05 −2.5252E−05  6.9581E−05  5.8356E−05 Surface # 7 8 9 10 11 k=  2.4912E+01  2.9588E+01 −5.9436E+01  2.8444E−02 −5.3476E+01 A4 =−6.8039E−02 −1.2587E−02  9.4191 E−02 −1.5451E−03 −4.6683E−02 A6 =−1.9459E−03  1.3403E−02  2.5158E−02  3.6235E−02  3.5797E−02 A8 = 1.9634E−02 −2.1359E−02 −6.9367E−02 −4.8980E−02 −3.0715E−02 A10 =−1.1151E−02  2.8515E−02  8.9210E−02  3.5045E−02  1.6353E−02 A12 = 2.5337E−03 −2.2030E−02 −6.6405E−02 −1.3572E−02 −5.2859E−03 A14 =−2.1575E−04  7.6117E−03  2.4080E−02  2.5186E−03  9.1816E−04 A16 = —−9.4089E−04 −3.2920E−03 −1.6398E−04 −6.7387E−05

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-14 represent the surfacessequentially arranged from the object side to the image side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A16 represent the asphericcoefficients ranging from the 4th order to the 16th order.

The tables presented below for each embodiment are the correspondingschematic parameter and aberration curves, and the definitions of theterms in the tables are the same as Table 1 and Table 2 of the 1stembodiment. Therefore, an explanation in this regard will not beprovided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 280. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 200, a first lens element 210, a second lens element 220, a thirdlens element 230, a fourth lens element 240, a fifth lens element 250, afilter 260 and an image surface 270. The optical imaging lens systemincludes five lens elements (210, 220, 230, 240 and 250) with noadditional lens element disposed between the first lens element 210 andthe fifth lens element 250.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being convex in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric.

The second lens element 220 with negative refractive power has anobject-side surface 221 being concave in a paraxial region thereof andan image-side surface 222 being concave in a paraxial region thereof.The second lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with positive refractive power has anobject-side surface 231 being concave in a paraxial region thereof andan image-side surface 232 being convex in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric.

The fourth lens element 240 with negative refractive power has anobject-side surface 241 being concave in a paraxial region thereof andan image-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric. Both the object-side surface 241 and the image-side surface242 of the fourth lens element 240 have at least one inflection point.

The fifth lens element 250 with negative refractive power has anobject-side surface 251 being concave in a paraxial region thereof andan image-side surface 252 being convex in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric. The object-side surface 251 of the fifth lens element 250 hasat least one inflection point.

The filter 260 is made of glass material and located between the fifthlens element 250 and the image surface 270, and will not affect thefocal length of the optical imaging lens system. The image sensor 280 isdisposed on or near the image surface 270 of the optical imaging lenssystem.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 8.64 mm, Fno = 2.40, HFOV = 16.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.877 2 Lens 1 2.287 (ASP)1.300 Plastic 1.545 56.0 3.52 3 −9.458 (ASP) 0.184 4 Lens 2 −4.406 (ASP)0.608 Plastic 1.614 26.0 −4.22 5 6.613 (ASP) 0.583 6 Lens 3 −19.608(ASP) 1.147 Plastic 1.660 20.4 4.52 7 −2.649 (ASP) 0.322 8 Lens 4 −1.571(ASP) 0.350 Plastic 1.660 20.4 −8.91 9 −2.334 (ASP) 0.661 10 Lens 5−2.629 (ASP) 0.416 Plastic 1.584 28.2 −7.65 11 −6.760 (ASP) 1.410 12Filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 1.317 14 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 6 k =  1.1864E−01−2.8283E+01  4.3618E+00 −1.5721E+01  8.2431E+01 A4 = −1.3043E−03 1.8347E−02  5.8974E−02  4.4120E−02 −3.2486E−02 A6 =  3.7119E−05−1.0917E−02 −2.8925E−02 −2.3382E−02 −1.3734E−02 A8 =  5.4734E−05 5.6941E−03  1.5658E−02  8.5472E−03 −4.6701E−03 A10 = −1.4204E−04−1.2594E−03 −4.1953E−03  2.1054E−03  5.7307E−03 A12 =  7.6470E−05−6.0769E−05  3.2054E−04 −2.5206E−03 −2.4650E−03 A14 = −1.4190E−05 4.4367E−05  5.9197E−05  4.5843E−04  6.4276E−05 Surface # 7 8 9 10 11 k= −1.1310E+01 −1.0146E+01 −1.8629E+01  8.9187E−01  5.2134E+00 A4 =−3.8938E−02  5.2709E−02  8.3166E−02  4.9502E−02  1.0817E−02 A6 =−1.3054E−02  9.9933E−03 −4.3330E−03 −8.3356E−02 −3.3438E−02 A8 = 1.9843E−02 −5.2207E−02 −6.8813E−02  6.2984E−02  2.4194E−02 A10 =−1.0895E−02  6.3131E−02  9.3478E−02 −3.1019E−02 −1.0452E−02 A12 = 2.9641E−03 −3.5972E−02 −5.8410E−02  1.0223E−02  2.7873E−03 A14 =−3.2953E−04  1.0303E−02  1.8853E−02 −1.7347E−03 −3.8778E−04 A16 = —−1.2101E−03 −2.4621E−03  1.4443E−04  1.7882E−05

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 8.64 |R9/R8| 1.13 Fno 2.40 |(R9 + R10)/(R9 − R10)|2.27 HFOV [deg.] 16.0 [(R5 − R6)*f]/(R5*R6) −2.82 tan(HFOV) 0.29 SD/TD0.84 V3 20.4 Y52*2/EPD 0.98 (V2 + V4)/2 23.19 Y52/Y11 0.98 V2 + V3 + V466.8 f/f3 1.91 CT5/T23 0.71 ImgH/f 0.30 CT4/T34 1.09 TL/f 0.98 T34/T121.75 P2 + P4 + P5 −4.15 (T23 − T45)/(T23 + T45) −0.06 (P2 + P4 + P5)/P44.28 ΣAT/CT3 1.53 |DsR5/DsR6| 0.61 ΣAT/(T23 + BL) 0.50 Ymax [mm] 1.81BL/ΣAT 1.68 — —

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 380. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 300, a first lens element 310, a second lens element 320, a stop301, a third lens element 330, a fourth lens element 340, a fifth lenselement 350, a filter 360 and an image surface 370. The optical imaginglens system includes five lens elements (310, 320, 330, 340 and 350)with no additional lens element disposed between the first lens element310 and the fifth lens element 350.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with negative refractive power has anobject-side surface 321 being concave in a paraxial region thereof andan image-side surface 322 being concave in a paraxial region thereof.The second lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with positive refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being concave in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric.

The fourth lens element 340 with negative refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being concave in a paraxial region thereof.The fourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric. Both the object-side surface 341 and the image-side surface342 of the fourth lens element 340 have at least one inflection point.

The fifth lens element 350 with negative refractive power has anobject-side surface 351 being concave in a paraxial region thereof andan image-side surface 352 being convex in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric. Both the object-side surface 351 and the image-side surface352 of the fifth lens element 350 have at least one inflection point.

The filter 360 is made of glass material and located between the fifthlens element 350 and the image surface 370, and will not affect thefocal length of the optical imaging lens system. The image sensor 380 isdisposed on or near the image surface 370 of the optical imaging lenssystem.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 10.66 mm, Fno = 2.60, HFOV = 15.1 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.790 2 Lens 1 2.730 (ASP)1.472 Plastic 1.545 56.1 5.11 3 116.070 (ASP) 0.105 4 Lens 2 −12.093(ASP) 0.350 Plastic 1.650 21.5 −5.44 5 5.065 (ASP) 0.500 6 Stop Plano0.465 7 Lens 3 3.596 (ASP) 1.147 Plastic 1.661 20.3 6.73 8 16.427 (ASP)0.325 9 Lens 4 −8.240 (ASP) 0.350 Plastic 1.650 21.5 −11.66 10 96.880(ASP) 1.424 11 Lens 5 −5.528 (ASP) 0.369 Plastic 1.544 56.0 −14.27 12−19.635 (ASP) 1.410 13 Filter Plano 0.210 Glass 1.517 64.2 — 14 Plano1.748 15 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).An effective radius of the stop 301 (Surface 6) is 1.592 mm.

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 7 k =  1.1192E−01 9.9000E+01  3.2676E+01 −2.6508E+00  2.2456E−02 A4 = −2.4039E−03 9.0957E−04  3.5776E−02  3.7183E−02 −1.8518E−02 A6 = −1.6877E−04−2.4411E−03 −1.5527E−02 −8.5438E−03  2.2959E−03 A8 =  1.7397E−06 2.5999E−03  8.7099E−03  3.2840E−03 −1.3568E−03 A10 = −1.0874E−04−1.4785E−03 −3.3283E−03  8.0673E−04  2.0251E−03 A12 =  3.5560E−05 3.0961E−04  5.6853E−04 −9.4958E−04 −8.1672E−04 A14 = −4.8703E−06−2.1629E−05 −2.9162E−05  1.6947E−04  9.1456E−05 Surface # 8 9 10 11 12 k=  1.5454E+01 −8.8330E+01  9.9000E+01 −1.1384E+00 −7.5350E+01 A4 =−7.3697E−02 −7.4618E−03  9.3335E−02  1.3864E−02 −2.9684E−03 A6 = 3.7837E−03  2.7355E−02  1.6385E−02 −2.1183E−03 −3.4395E−03 A8 = 1.9443E−02 −2.7695E−02 −2.1821E−02 −2.8341E−03  3.3512E−04 A10 =−1.1253E−02  2.1637E−02  5.9019E−03  2.6159E−03  3.5944E−05 A12 = 2.5222E−03 −1.3512E−02 −3.2238E−03 −1.0303E−03  1.9237E−05 A14 =−2.0948E−04  4.3687E−03  1.9042E−03  2.0047E−04 −1.6377E−05 A16 = —−5.2847E−04 −3.5040E−04 −1.4683E−05  2.5465E−06

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 10.66 |R9/R8| 0.06 Fno 2.60 |(R9 + R10)/(R9 −R10)| 1.78 HFOV [deg.] 15.1 [(R5 − R6)*f]/(R5*R6) −2.32 tan(HFOV) 0.27SD/TD 0.88 V3 20.3 Y52*2/EPD 0.99 (V2 + V4)/2 21.47 Y52/Y11 0.99 V2 +V3 + V4 63.3 f/f3 1.58 CT5/T23 0.38 ImgH/f 0.28 CT4/T34 1.08 TL/f 0.93T34/T12 3.10 P2 + P4 + P5 −3.62 (T23 − T45)/(T23 + T45) −0.19 (P2 + P4 +P5)/P4 3.96 ΣAT/CT3 2.46 |DsR5/DsR6| 0.65 ΣAT/(T23 + BL) 0.65 Ymax [mm]2.05 BL/ΣAT 1.19 — —

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 480. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 400, a first lens element 410, a second lens element 420, a stop401, a third lens element 430, a fourth lens element 440, a fifth lenselement 450, a filter 460 and an image surface 470. The optical imaginglens system includes five lens elements (410, 420, 430, 440 and 450)with no additional lens element disposed between the first lens element410 and the fifth lens element 450.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being convex in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric.

The second lens element 420 with negative refractive power has anobject-side surface 421 being concave in a paraxial region thereof andan image-side surface 422 being concave in a paraxial region thereof.The second lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric.

The third lens element 430 with positive refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being convex in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric.

The fourth lens element 440 with negative refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being concave in a paraxial region thereof.The fourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric. Both the object-side surface 441 and the image-side surface442 of the fourth lens element 440 have at least one inflection point.

The fifth lens element 450 with negative refractive power has anobject-side surface 451 being concave in a paraxial region thereof andan image-side surface 452 being convex in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric.

The filter 460 is made of glass material and located between the fifthlens element 450 and the image surface 470, and will not affect thefocal length of the optical imaging lens system. The image sensor 480 isdisposed on or near the image surface 470 of the optical imaging lenssystem.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 10.64 mm, Fno = 2.60, HFOV = 15.1 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.800 2 Lens 1 2.845 (ASP)1.428 Plastic 1.545 56.1 5.07 3 −77.399 (ASP) 0.114 4 Lens 2 −11.514(ASP) 0.350 Plastic 1.650 21.5 −6.78 5 7.232 (ASP) 0.600 6 Stop Plano0.543 7 Lens 3 5.576 (ASP) 1.147 Plastic 1.661 20.3 5.23 8 −8.330 (ASP)0.210 9 Lens 4 −4.022 (ASP) 0.354 Plastic 1.650 21.5 −5.76 10 57.201(ASP) 1.462 11 Lens 5 −4.175 (ASP) 0.446 Plastic 1.544 56.0 −14.41 12−9.265 (ASP) 1.410 13 Filter Plano 0.210 Glass 1.517 64.2 — 14 Plano1.615 15 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).An effective radius of the stop 401 (Surface 6) is 1.652 mm.

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 7 k =  1.3055E−01−9.9000E+01  2.2373E+01 −1.5381E+01 −2.4334E+00 A4 = −1.7456E−03 5.6829E−03  2.7893E−02  2.8517E−02 −1.7864E−02 A6 =  1.5490E−04−4.8483E−03 −1.0592E−02 −4.7839E−03  2.8872E−03 A8 = −2.6536E−04 2.3540E−03  4.9360E−03  1.7526E−03 −3.0046E−03 A10 =  3.2931E−05−5.3228E−04 −1.1786E−03  7.3012E−04  2.6509E−03 A12 =  2.7701E−06−4.8238E−06  7.3310E−06 −7.3245E−04 −1.1357E−03 A14 = −1.3683E−06 1.0156E−05  2.2380E−05  1.2962E−04  1.5606E−04 Surface # 8 9 10 11 12 k= −9.9000E+01 −4.8049E+01 −9.9000E+01  4.4010E+00  1.9381E+01 A4 =−7.5631E−02 −7.3537E−03  1.3057E−01 −1.1383E−02 −1.6587E−02 A6 = 3.7874E−02  6.6338E−02 −3.7850E−02  3.7220E−02  1.0011E−02 A8 =−1.2384E−02 −8.4519E−02 −5.4509E−03 −7.0828E−02 −1.7604E−02 A10 = 1.8004E−03  5.7729E−02  9.1511E−03  6.5383E−02  1.2965E−02 A12 =−5.2570E−05 −2.3587E−02 −3.6534E−03 −3.3398E−02 −5.2242E−03 A14 =−8.4016E−06  5.3967E−03  9.9616E−04  8.9300E−03  1.0920E−03 A16 = —−5.2856E−04 −1.5587E−04 −9.8021E−04 −9.4178E−05

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 10.64 |R9/R8| 0.07 Fno 2.60 |(R9 + R10)/(R9 −R10)| 2.64 HFOV [deg.] 15.1 [(R5 − R6)*f]/(R5*R6) −3.19 tan(HFOV) 0.27SD/TD 0.88 V3 20.3 Y52*2/EPD 0.96 (V2 + V4)/2 21.47 Y52/Y11 0.96 V2 +V3 + V4 63.3 f/f3 2.04 CT5/T23 0.39 ImgH/f 0.28 CT4/T34 1.69 TL/f 0.93T34/T12 1.84 P2 + P4 + P5 −4.15 (T23 − T45)/(T23 + T45) −0.12 (P2 + P4 +P5)/P4 2.25 ΣAT/CT3 2.55 |DsR5/DsR6| 0.66 ΣAT/(T23 + BL) 0.67 Ymax [mm]2.05 BL/ΣAT 1.10 — —

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 580. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 500, a first lens element 510, a second lens element 520, a thirdlens element 530, a fourth lens element 540, a fifth lens element 550, astop 501, a filter 560 and an image surface 570. The optical imaginglens system includes five lens elements (510, 520, 530, 540 and 550)with no additional lens element disposed between the first lens element510 and the fifth lens element 550.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being convex in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric.

The second lens element 520 with negative refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being concave in a paraxial region thereof.The second lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with positive refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being convex in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric.

The fourth lens element 540 with negative refractive power has anobject-side surface 541 being concave in a paraxial region thereof andan image-side surface 542 being convex in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric. Both the object-side surface 541 and the image-side surface542 of the fourth lens element 540 have at least one inflection point.

The fifth lens element 550 with negative refractive power has anobject-side surface 551 being concave in a paraxial region thereof andan image-side surface 552 being convex in a paraxial region thereof. Thefifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric.

The filter 560 is made of glass material and located between the fifthlens element 550 and the image surface 570, and will not affect thefocal length of the optical imaging lens system. The image sensor 580 isdisposed on or near the image surface 570 of the optical imaging lenssystem.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 10.63 mm, Fno = 2.60, HFOV = 15.1 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.822 2 Lens 1 2.777 (ASP)1.460 Plastic 1.545 56.1 4.90 3 −56.414 (ASP) 0.163 4 Lens 2 −12.212(ASP) 0.350 Plastic 1.650 21.5 −6.70 5 6.857 (ASP) 1.104 6 Lens 3 7.505(ASP) 1.147 Plastic 1.661 20.3 6.06 7 −8.063 (ASP) 0.152 8 Lens 4 −4.297(ASP) 0.350 Plastic 1.650 21.5 −7.79 9 −29.279 (ASP) 1.368 10 Lens 5−2.945 (ASP) 0.353 Plastic 1.544 56.0 −10.75 11 −6.183 (ASP) 0.200 12Stop Plano 1.210 13 Filter Plano 0.210 Glass 1.517 64.2 — 14 Plano 1.67015 Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 501 (Surface 12) is 2.026 mm.

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 k =  1.0085E−01−8.8285E+01  1.8008E+01 −1.2653E+01 −1.2999E+01 A4 = −1.6373E−03 1.5529E−02  4.9104E−02  4.4573E−02 −1.2690E−02 A6 = −2.5578E−04−1.4081E−02 −3.4273E−02 −1.8800E−02 −2.0317E−03 A8 =  2.1467E−04 5.6798E−03  1.5477E−02  4.5619E−03 −4.7841E−03 A10 = −2.1877E−04−9.1757E−04 −3.4125E−03  2.2085E−03  4.4446E−03 A12 =  6.7100E−05−3.0022E−05  1.9087E−04 −1.5980E−03 −1.7841E−03 A14 = −7.9093E−06 1.4775E−05  2.2587E−05  2.5802E−04  2.4215E−04 Surface # 7 8 9 10 11 k= −1.4014E+01 −3.5382E+01  4.0736E+01  1.3090E+00  9.6966E+00 A4 =−4.7043E−02  4.8117E−02  1.4355E−01  1.8383E−02  3.7337E−03 A6 =−8.2687E−03  5.0751E−03 −6.7256E−03 −6.5361E−03 −1.1946E−02 A8 = 2.2468E−02 −5.2636E−02 −7.5732E−02 −8.1590E−03  5.7353E−03 A10 =−1.2730E−02  6.4163E−02  9.4516E−02  9.8842E−03 −2.8746E−03 A12 = 3.1254E−03 −3.7305E−02 −5.8658E−02 −4.9333E−03  1.1103E−03 A14 =−2.9320E−04  1.0700E−02  1.8878E−02  1.2040E−03 −2.5463E−04 A16 = —−1.2133E−03 −2.4621E−03 −1.2283E−04  2.3203E−05

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 10.63 |R9/R8| 0.10 Fno 2.60 |(R9 + R10)/(R9 −R10)| 2.82 HFOV [deg.] 15.1 [(R5 − R6)*f]/(R5*R6) −2.74 tan(HFOV) 0.27SD/TD 0.87 V3 20.3 Y52*2/EPD 0.88 (V2 + V4)/2 21.47 Y52/Y11 0.88 V2 +V3 + V4 63.3 f/f3 1.75 CT5/T23 0.32 ImgH/f 0.28 CT4/T34 2.30 TL/f 0.92T34/T12 0.93 P2 + P4 + P5 −3.94 (T23 − T45)/ −0.11 (P2 + P4 + P5)/P42.89 (T23 + T45) |DsR5/DsR6| 0.66 ΣAT/CT3 2.43 Ymax [mm] 2.05 ΣAT/(T23 +BL) 0.63 — — BL/ΣAT 1.18

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 680. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 600, a first lens element 610, a second lens element 620, a stop601, a third lens element 630, a fourth lens element 640, a fifth lenselement 650, a filter 660 and an image surface 670. The optical imaginglens system includes five lens elements (610, 620, 630, 640 and 650)with no additional lens element disposed between the first lens element610 and the fifth lens element 650.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being convex in a paraxial region thereof. Thefirst lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric.

The second lens element 620 with negative refractive power has anobject-side surface 621 being concave in a paraxial region thereof andan image-side surface 622 being concave in a paraxial region thereof.The second lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric.

The third lens element 630 with positive refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being concave in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being concave in a paraxial region thereof andan image-side surface 642 being concave in a paraxial region thereof.The fourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric. The image-side surface 642 of the fourth lens element 640 hasat least one inflection point.

The fifth lens element 650 with negative refractive power has anobject-side surface 651 being concave in a paraxial region thereof andan image-side surface 652 being convex in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric. Both the object-side surface 651 and the image-side surface652 of the fifth lens element 650 have at least one inflection point.

The filter 660 is made of glass material and located between the fifthlens element 650 and the image surface 670, and will not affect thefocal length of the optical imaging lens system. The image sensor 680 isdisposed on or near the image surface 670 of the optical imaging lenssystem.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 10.65 mm, Fno = 2.60, HFOV = 15.1 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.762 2 Lens 1 2.815 (ASP)1.444 Plastic 1.545 56.1 5.05 3 −100.000 (ASP) 0.127 4 Lens 2 −11.298(ASP) 0.350 Plastic 1.650 21.5 −5.54 5 5.352 (ASP) 0.500 6 Stop Plano0.522 7 Lens 3 3.596 (ASP) 1.147 Plastic 1.661 20.3 6.40 8 21.072 (ASP)0.305 9 Lens 4 −6.687 (ASP) 0.350 Plastic 1.650 21.5 −9.62 10 100.000(ASP) 1.567 11 Lens 5 −3.784 (ASP) 0.369 Plastic 1.544 56.0 −14.73 12−7.418 (ASP) 1.410 13 Filter Plano 0.210 Glass 1.517 64.2 — 14 Plano1.576 15 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).An effective radius of the stop 601 (Surface 6) is 1.624 mm.

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 7 k =  1.1423E−01−9.9000E+01  2.6036E+01 −8.3070E+00  8.8027E−02 A4 = −1.6866E−03 8.0709E−03  3.1773E−02  2.9646E−02 −1.7960E−02 A6 = −2.7196E−04−8.9250E−03 −1.5896E−02 −5.1749E−03  2.6060E−03 A8 =  3.8999E−05 5.8174E−03  1.0151E−02  4.1801E−03 −8.5209E−04 A10 = −1.1163E−04−2.2895E−03 −4.0265E−03 −1.0770E−03  1.3589E−03 A12 =  3.6237E−05 4.1122E−04  7.2383E−04 −2.0363E−04 −6.0964E−04 A14 = −4.8056E−06−2.6927E−05 −4.3800E−05  7.2916E−05  7.1742E−05 Surface # 8 9 10 11 12 k=  7.1458E+01 −6.8802E+01 −9.9000E+01 −3.7126E+00 −9.9000E+01 A4 =−6.5719E−02  6.0341E−03  1.0802E−01  2.6427E−02 −1.2072E−02 A6 =−5.7726E−04  8.4751E−03 −1.4390E−03 −1.3575E−02  5.8496E−03 A8 = 2.0246E−02 −2.0185E−02 −1.9600E−02  4.2795E−03 −5.4540E−03 A10 =−1.1223E−02  2.0883E−02  1.1567E−02 −1.0931E−03  2.1381E−03 A12 = 2.4997E−03 −1.3145E−02 −6.0163E−03  2.3963E−04 −4.3621E−04 A14 =−2.0789E−04  4.0944E−03  2.3090E−03 −3.5102E−05  3.9671E−05 A16 = —−4.8260E−04 −3.5758E−04  3.0120E−06 −6.3329E−07

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 10.65 |R9/R8| 0.04 Fno 2.60 |(R9 + R10)/(R9 −R10)| 3.08 HFOV [deg.] 15.1 [(R5 − R6)*f]/(R5*R6) −2.46 tan(HFOV) 0.27SD/TD 0.89 V3 20.3 Y52*2/EPD 1.00 (V2 + V4)/2 21.47 Y52/Y11 1.00 V2 +V3 + V4 63.3 f/f3 1.67 CT5/T23 0.36 ImgH/f 0.28 CT4/T34 1.15 TL/f 0.93T34/T12 2.40 P2 + P4 + P5 −3.75 (T23 − T45)/ −0.21 (P2 + P4 + P5)/P43.39 (T23 + T45) |DsR5/DsR6| 0.66 ΣAT/CT3 2.63 Ymax [mm] 2.06 ΣAT/(T23 +BL) 0.72 — — BL/ΣAT 1.06

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 780. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 700, a first lens element 710, a second lens element 720, a stop701, a third lens element 730, a fourth lens element 740, a fifth lenselement 750, a filter 760 and an image surface 770. The optical imaginglens system includes five lens elements (710, 720, 730, 740 and 750)with no additional lens element disposed between the first lens element710 and the fifth lens element 750.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being convex in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric.

The second lens element 720 with negative refractive power has anobject-side surface 721 being concave in a paraxial region thereof andan image-side surface 722 being concave in a paraxial region thereof.The second lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with positive refractive power has anobject-side surface 731 being convex in a paraxial region thereof and animage-side surface 732 being convex in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric.

The fourth lens element 740 with negative refractive power has anobject-side surface 741 being concave in a paraxial region thereof andan image-side surface 742 being convex in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric. Both the object-side surface 741 and the image-side surface742 of the fourth lens element 740 have at least one inflection point.

The fifth lens element 750 with negative refractive power has anobject-side surface 751 being concave in a paraxial region thereof andan image-side surface 752 being convex in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric.

The filter 760 is made of glass material and located between the fifthlens element 750 and the image surface 770, and will not affect thefocal length of the optical imaging lens system. The image sensor 780 isdisposed on or near the image surface 770 of the optical imaging lenssystem.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 9.59 mm, Fno = 2.80, HFOV = 15.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.507 2 Lens 1 2.833 (ASP)1.800 Plastic 1.545 56.1 4.44 3 −12.825 (ASP) 0.152 4 Lens 2 −6.882(ASP) 0.784 Plastic 1.650 21.5 −2.93 5 2.751 (ASP) 0.378 6 Stop Plano−0.100 7 Lens 3 2.608 (ASP) 1.055 Plastic 1.661 20.3 2.80 8 −5.325 (ASP)0.212 9 Lens 4 −2.512 (ASP) 0.463 Plastic 1.661 20.3 −4.94 10 −11.760(ASP) 0.568 11 Lens 5 −8.702 (ASP) 0.705 Plastic 1.544 56.0 −16.74 12−200.000 (ASP) 1.296 13 Filter Plano 0.210 Glass 1.517 64.2 — 14 Plano2.067 15 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).An effective radius of the stop 701 (Surface 6) is 1.309 mm.

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 7 k =  1.0977E−01−9.9000E+01  1.2786E+01 −1.0111E+01 −5.8464E+00 A4 = −1.8577E−03 2.1274E−02  4.6530E−02  5.0047E−02 −5.0344E−03 A6 = −5.0615E−04−2.0590E−02 −3.1468E−02 −2.4214E−02 −1.9332E−03 A8 =  7.6452E−05 1.0844E−02  1.8955E−02  1.4457E−02 −2.4973E−03 A10 = −7.0711E−05−4.3536E−03 −7.7852E−03 −2.2696E−03  2.1585E−03 A12 =  1.7927E−05 1.1390E−03  1.9417E−03 −5.0344E−04  1.1041E−03 A14 = −2.2843E−06−1.3220E−04 −2.0365E−04  3.2834E−05 −7.0965E−04 Surface # 8 9 10 11 12 k= −9.9000E+01 −1.7855E+01  5.1400E+01  2.4796E+01  9.9000E+01 A4 =−7.4083E−02  8.2239E−02  2.0057E−01 −2.8513E−02 −4.4281E−02 A6 = 6.7875E−02 −3.7149E−02 −1.1926E−01  4.4313E−03  1.1817E−03 A8 =−8.1614E−02 −1.2474E−02  9.0324E−02 −4.0148E−02  3.4416E−03 A10 = 6.0252E−02  1.5056E−02 −8.5890E−02  7.1412E−02 −3.4632E−03 A12 =−2.1699E−02  6.1341E−03  6.6129E−02 −6.3208E−02  1.3159E−03 A14 = 2.8953E−03 −8.7437E−03 −2.7788E−02  2.8417E−02 −2.1773E−04 A16 = — 2.0515E−03  4.5595E−03 −5.1721E−03  2.9690E−06

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 9.59 |R9/R8| 0.74 Fno 2.80 |(R9 + R10)/(R9 − R10)|1.09 HFOV [deg.] 15.0 [(R5 − R6)*f]/(R5*R6) −5.48 tan(HFOV) 0.27 SD/TD0.92 V3 20.3 Y52*2/EPD 0.98 (V2 + V4)/2 20.91 Y52/Y11 0.98 V2 + V3 + V462.2 f/f3 3.43 CT5/T23 2.54 ImgH/f 0.27 CT4/T34 2.18 TL/f 1.00 T34/T121.39 P2 + P4 + P5 −5.79 (T23 − T45)/ −0.34 (P2 + P4 + P5)/P4 2.98 (T23 +T45) |DsR5/DsR6| 0.70 ΣAT/CT3 1.15 Ymax [mm] 1.71 ΣAT/(T23 + BL) 0.31 —— BL/ΣAT 2.95

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 880. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 800, a first lens element 810, a second lens element 820, a thirdlens element 830, a fourth lens element 840, a fifth lens element 850, afilter 860, and an image surface 870. The optical imaging lens systemincludes five lens elements (810, 820, 830, 840 and 850) with noadditional lens element disposed between the first lens element 810 andthe fifth lens element 850.

The first lens element 810 with positive refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being convex in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric.

The second lens element 820 with negative refractive power has anobject-side surface 821 being convex in a paraxial region thereof and animage-side surface 822 being concave in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric.

The third lens element 830 with positive refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being convex in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric.

The fourth lens element 840 with negative refractive power has anobject-side surface 841 being concave in a paraxial region thereof andan image-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric. Both the object-side surface 841 and the image-side surface842 of the fourth lens element 840 have at least one inflection point.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being concave in a paraxial region thereof andan image-side surface 852 being convex in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric. The object-side surface 851 of the fifth lens element 850 hasat least one inflection point.

The filter 860 is made of glass material and located between the fifthlens element 850 and the image surface 870, and will not affect thefocal length of the optical imaging lens system. The image sensor 880 isdisposed on or near the image surface 870 of the optical imaging lenssystem.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 9.89 mm, Fno = 2.80, HFOV = 14.9 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.751 2 Lens 1 2.442 (ASP)1.283 Plastic 1.545 56.1 4.39 3 −90.909 (ASP) 0.100 4 Lens 2 47.619(ASP) 0.350 Plastic 1.660 20.4 −4.41 5 2.733 (ASP) 0.583 6 Lens 3 3.202(ASP) 1.147 Plastic 1.671 19.3 4.38 7 −30.802 (ASP) 0.219 8 Lens 4−3.798 (ASP) 0.350 Plastic 1.660 20.4 −5.94 9 −123.457 (ASP) 0.761 10Lens 5 −2.881 (ASP) 1.259 Plastic 1.544 56.0 −20.30 11 −4.498 (ASP)1.410 12 Filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 1.795 14 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 6 k =  1.0451E−01−9.0000E+01  4.0120E+01 −2.8343E+00 −1.2561E+00 A4 = −1.3419E−03 2.3581E−02  3.7673E−02  4.9739E−02 −1.6580E−03 A6 = −1.6155E−04−1.4959E−02 −2.8161E−02 −1.8754E−02 −1.6343E−05 A8 =  2.7971E−04 5.6791E−03  9.4943E−03  7.0650E−03 −4.3484E−03 A10 = −2.0738E−04−9.4292E−04 −3.1066E−04  2.4433E−03  4.7253E−03 A12 =  6.4984E−05−6.0987E−05 −7.7497E−04 −1.9690E−03 −1.5493E−03 A14 = −6.8927E−06 2.8801E−05  1.5370E−04  3.7353E−04  1.7894E−04 Surface # 7 8 9 10 11 k= −9.8538E+01 −2.9489E+01  9.8576E+01  3.9427E−01  2.6901E+00 A4 =−4.5069E−02  4.9568E−02  1.7142E−01  2.6882E−02  3.3059E−03 A6 =−7.7786E−03  6.7221E−03 −8.5227E−05 −4.0059E−02 −3.1898E−03 A8 = 2.3271E−02 −5.4686E−02 −7.9438E−02  9.9393E−02  3.9660E−03 A10 =−1.2662E−02  6.2766E−02  9.3026E−02 −1.2532E−01 −3.0742E−03 A12 = 2.8955E−03 −3.7478E−02 −5.8280E−02  8.3916E−02  1.1770E−03 A14 =−2.2973E−04  1.0866E−02  1.8851E−02 −2.7852E−02 −2.1949E−04 A16 = —−1.2105E−03 −2.4621E−03  3.6804E−03  1.5669E−05

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 9.89 |R9/R8| 0.02 Fno 2.80 |(R9 + R10)/(R9 − R10)|4.56 HFOV [deg.] 14.9 [(R5 − R6)*f]/(R5*R6) −3.41 tan(HFOV) 0.27 SD/TD0.88 V3 19.3 Y52*2/EPD 1.06 (V2 + V4)/2 20.40 Y52/Y11 1.06 V2 + V3 + V460.1 f/f3 2.26 CT5/T23 2.16 ImgH/f 0.28 CT4/T34 1.60 TL/f 0.96 T34/T122.19 P2 + P4 + P5 −4.39 (T23 − T45)/ −0.13 (P2 + P4 + P5)/P4 2.64 (T23 +T45) |DsR5/DsR6| 0.58 ΣAT/CT3 1.45 Ymax [mm] 1.87 ΣAT/(T23 + BL) 0.42 —— BL/ΣAT 2.05

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 980. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 900, a first lens element 910, a second lens element 920, a thirdlens element 930, a fourth lens element 940, a fifth lens element 950, afilter 960 and an image surface 970. The optical imaging lens systemincludes five lens elements (910, 920, 930, 940 and 950) with noadditional lens element disposed between the first lens element 910 andthe fifth lens element 950.

The first lens element 910 with positive refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being convex in a paraxial region thereof. Thefirst lens element 910 is made of plastic material and has theobject-side surface 911 and the image-side surface 912 being bothaspheric.

The second lens element 920 with negative refractive power has anobject-side surface 921 being concave in a paraxial region thereof andan image-side surface 922 being convex in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric.

The third lens element 930 with positive refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being concave in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric.

The fourth lens element 940 with negative refractive power has anobject-side surface 941 being concave in a paraxial region thereof andan image-side surface 942 being convex in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric. Both the object-side surface 941 and the image-side surface942 of the fourth lens element 940 have at least one inflection point.

The fifth lens element 950 with negative refractive power has anobject-side surface 951 being concave in a paraxial region thereof andan image-side surface 952 being convex in a paraxial region thereof. Thefifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric.

The filter 960 is made of glass material and located between the fifthlens element 950 and the image surface 970, and will not affect thefocal length of the optical imaging lens system. The image sensor 980 isdisposed on or near the image surface 970 of the optical imaging lenssystem.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 9.00 mm, Fno = 2.25, HFOV = 15.6 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.807 2 Lens 1 2.738 (ASP)1.284 Plastic 1.511 56.8 4.22 3 −8.518 (ASP) 0.306 4 Lens 2 −2.918 (ASP)1.000 Plastic 1.634 23.8 −5.58 5 −18.868 (ASP) 0.394 6 Lens 3 4.429(ASP) 1.508 Plastic 1.660 20.4 6.91 7 134.307 (ASP) 0.340 8 Lens 4−3.054 (ASP) 0.469 Plastic 1.650 21.5 −7.66 9 −8.371 (ASP) 0.760 10 Lens5 −7.692 (ASP) 0.656 Plastic 1.559 40.4 −15.11 11 −89.593 (ASP) 1.410 12Filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 0.882 14 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 18 Aspheric Coefficients Surface # 2 3 4 5 6 k =  1.8406E−01−3.6574E+01  6.2547E−01 −1.6772E+01 −3.1624E+00 A4 = −2.6161E−03 1.1277E−02  7.7195E−02  5.7841E−02 −9.3268E−04 A6 =  1.0647E−04−4.0369E−03 −2.6627E−02 −2.3758E−02 −9.1633E−03 A8 = −4.7111E−04 1.7179E−03  9.9047E−03  9.9296E−03  4.2294E−03 A10 =  1.9887E−04−6.0016E−04 −2.6124E−03 −3.0119E−03 −8.9168E−04 A12 = −4.3517E−05 8.4118E−05  3.9878E−04  5.8673E−04  8.6734E−05 A14 =  2.2783E−06−2.4799E−06 −2.1904E−05 −5.1416E−05 −8.1290E−06 Surface # 7 8 9 10 11 k= −6.5735E+01 −2.6005E+01  2.2654E+00 −9.7075E+01  1.2138E+01 A4 =−5.0116E−02 −2.8978E−03  1.5384E−01 −2.4496E−02 −2.1601E−02 A6 = 4.9886E−03  6.1140E−02 −2.2486E−02  3.6873E−02  1.0481E−02 A8 = 6.3177E−03 −8.3143E−02 −1.3624E−02 −6.7218E−02 −1.7885E−02 A10 =−3.6171E−03  5.7320E−02  7.8498E−03  6.2703E−02  1.3157E−02 A12 = 7.6489E−04 −2.3824E−02 −2.8277E−03 −3.2703E−02 −5.2381E−03 A14 =−6.1604E−05  5.4925E−03  9.8286E−04  8.8816E−03  1.0679E−03 A16 = —−5.3732E−04 −1.6156E−04 −9.8464E−04 −8.8984E−05

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 9.00 |R9/R8| 0.92 Fno 2.25 |(R9 + R10)/(R9 − R10)|1.19 HFOV [deg.] 15.6 [(R5 − R6)*f]/(R5*R6) −1.97 tan(HFOV) 0.28 SD/TD0.88 V3 20.4 Y52*2/EPD 0.97 (V2 + V4)/2 22.66 Y52/Y11 0.97 V2 + V3 + V465.7 f/f3 1.30 CT5/T23 1.66 ImgH/f 0.29 CT4/T34 1.38 TL/f 1.02 T34/T121.11 P2 + P4 + P5 −3.38 (T23 − T45)/ −0.32 (P2 + P4 + P5)/P4 2.88 (T23 +T45) |DsR5/DsR6| 0.59 ΣAT/CT3 1.19 Ymax [mm] 2.00 ΣAT/(T23 + BL) 0.62 —— BL/ΣAT 1.39

10th Embodiment

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure. FIG. 20 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 10thembodiment. In FIG. 19 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 1080. The optical imaging lens systemincludes, in order from an object side to an image side, a first lenselement 1010, an aperture stop 1000, a second lens element 1020, a thirdlens element 1030, a fourth lens element 1040, a fifth lens element1050, a filter 1060 and an image surface 1070. The optical imaging lenssystem includes five lens elements (1010, 1020, 1030, 1040 and 1050)with no additional lens element disposed between the first lens element1010 and the fifth lens element 1050.

The first lens element 1010 with positive refractive power has anobject-side surface 1011 being convex in a paraxial region thereof andan image-side surface 1012 being convex in a paraxial region thereof.The first lens element 1010 is made of plastic material and has theobject-side surface 1011 and the image-side surface 1012 being bothaspheric.

The second lens element 1020 with negative refractive power has anobject-side surface 1021 being concave in a paraxial region thereof andan image-side surface 1022 being concave in a paraxial region thereof.The second lens element 1020 is made of plastic material and has theobject-side surface 1021 and the image-side surface 1022 being bothaspheric.

The third lens element 1030 with positive refractive power has anobject-side surface 1031 being concave in a paraxial region thereof andan image-side surface 1032 being convex in a paraxial region thereof.The third lens element 1030 is made of plastic material and has theobject-side surface 1031 and the image-side surface 1032 being bothaspheric.

The fourth lens element 1040 with negative refractive power has anobject-side surface 1041 being concave in a paraxial region thereof andan image-side surface 1042 being convex in a paraxial region thereof.The fourth lens element 1040 is made of plastic material and has theobject-side surface 1041 and the image-side surface 1042 being bothaspheric. Both the object-side surface 1041 and the image-side surface1042 of the fourth lens element 1040 have at least one inflection point.

The fifth lens element 1050 with negative refractive power has anobject-side surface 1051 being concave in a paraxial region thereof andan image-side surface 1052 being convex in a paraxial region thereof.The fifth lens element 1050 is made of plastic material and has theobject-side surface 1051 and the image-side surface 1052 being bothaspheric.

The filter 1060 is made of glass material and located between the fifthlens element 1050 and the image surface 1070, and will not affect thefocal length of the optical imaging lens system. The image sensor 1080is disposed on or near the image surface 1070 of the optical imaginglens system.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th Embodiment f = 8.78 mm, Fno = 2.63, HFOV = 15.6 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 2.210 (ASP) 1.290 Plastic 1.545 56.0 3.602 −13.835 (ASP) 0.050 3 Ape. Stop Plano 0.116 4 Lens 2 −4.937 (ASP)0.552 Plastic 1.614 26.0 −5.32 5 10.036 (ASP) 0.354 6 Lens 3 −60.972(ASP) 1.147 Plastic 1.660 20.4 6.34 7 −3.943 (ASP) 0.273 8 Lens 4 −2.475(ASP) 0.350 Plastic 1.650 21.5 −8.84 9 −4.587 (ASP) 0.581 10 Lens 5−2.325 (ASP) 0.821 Plastic 1.614 26.0 −8.98 11 −4.563 (ASP) 1.410 12Filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 1.325 14 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 20 Aspheric Coefficients Surface # 1 2 4 5 6 k =  1.3278E−01−1.9251E+01  7.4853E+00 −2.9864E+01  9.9000E+01 A4 = −1.4579E−03 1.8162E−02  5.8158E−02  4.1913E−02 −2.8900E−02 A6 = −1.3302E−04−1.0955E−02 −2.8813E−02 −2.5270E−02 −1.4928E−02 A8 =  1.6058E−05 5.5663E−03  1.6246E−02  7.9759E−03 −5.8608E−03 A10 = −1.1063E−04−1.4406E−03 −4.0417E−03  2.3843E−03  6.2617E−03 A12 =  7.9940E−05−1.2070E−04  2.9266E−05 −2.3645E−03 −3.0531E−03 A14 = −2.4617E−05 1.0660E−04  2.2912E−04  5.6435E−04  3.0917E−04 Surface # 7 8 9 10 11 k= −1.2068E+01 −1.3017E+01 −3.0454E+01  6.5875E−01  4.3954E+00 A4 =−4.2942E−02  3.6606E−02  1.1098E−01  2.0625E−02  1.9551E−03 A6 =−1.4294E−02  5.5550E−03 −5.3459E−03  4.4711E−02  7.3256E−03 A8 = 1.8803E−02 −5.3289E−02 −7.0668E−02 −1.5333E−01 −1.1096E−02 A10 =−1.1041E−02  6.2893E−02  9.2955E−02  2.1453E−01  5.7783E−03 A12 = 3.3258E−03 −3.6845E−02 −5.8182E−02 −1.6024E−01 −9.9452E−04 A14 =−3.3392E−04  1.0934E−02  1.8869E−02  6.2521E−02 −1.1117E−04 A16 = —−1.2101E−03 −2.4622E−03 −9.9427E−03  3.8822E−05

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 8.78 |R9/R8| 0.51 Fno 2.63 |(R9 + R10)/(R9 −R10)| 3.08 HFOV [deg.] 15.6 [(R5 − R6)*f]/(R5*R6) −2.08 tan(HFOV) 0.28SD/TD 0.76 V3 20.4 Y52*2/EPD 1.02 (V2 + V4)/2 23.72 Y52/Y11 0.97 V2 +V3 + V4 67.8 f/f3 1.39 CT5/T23 2.32 ImgH/f 0.29 CT4/T34 1.28 TL/f 0.97T34/T12 1.64 P2 + P4 + P5 −3.62 (T23 − T45)/ −0.24 (P2 + P4 + P5)/P43.65 (T23 + T45) |DsR5/DsR6| 0.47 ΣAT/CT3 1.20 Ymax [mm] 1.75 ΣAT/(T23 +BL) 0.42 — — BL/ΣAT 2.14

11th Embodiment

FIG. 21 is a schematic view of an image capturing unit according to the11th embodiment of the present disclosure. FIG. 22 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 11thembodiment. In FIG. 21 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 1180. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 1100, a first lens element 1110, a second lens element 1120, athird lens element 1130, a fourth lens element 1140, a fifth lenselement 1150, a filter 1160 and an image surface 1170. The opticalimaging lens system includes five lens elements (1110, 1120, 1130, 1140and 1150) with no additional lens element disposed between the firstlens element 1110 and the fifth lens element 1150.

The first lens element 1110 with positive refractive power has anobject-side surface 1111 being convex in a paraxial region thereof andan image-side surface 1112 being convex in a paraxial region thereof.The first lens element 1110 is made of plastic material and has theobject-side surface 1111 and the image-side surface 1112 being bothaspheric.

The second lens element 1120 with negative refractive power has anobject-side surface 1121 being concave in a paraxial region thereof andan image-side surface 1122 being concave in a paraxial region thereof.The second lens element 1120 is made of plastic material and has theobject-side surface 1121 and the image-side surface 1122 being bothaspheric.

The third lens element 1130 with positive refractive power has anobject-side surface 1131 being convex in a paraxial region thereof andan image-side surface 1132 being concave in a paraxial region thereof.The third lens element 1130 is made of plastic material and has theobject-side surface 1131 and the image-side surface 1132 being bothaspheric.

The fourth lens element 1140 with negative refractive power has anobject-side surface 1141 being concave in a paraxial region thereof andan image-side surface 1142 being convex in a paraxial region thereof.The fourth lens element 1140 is made of plastic material and has theobject-side surface 1141 and the image-side surface 1142 being bothaspheric. Both the object-side surface 1141 and the image-side surface1142 of the fourth lens element 1140 have at least one inflection point.

The fifth lens element 1150 with negative refractive power has anobject-side surface 1151 being concave in a paraxial region thereof andan image-side surface 1152 being concave in a paraxial region thereof.The fifth lens element 1150 is made of plastic material and has theobject-side surface 1151 and the image-side surface 1152 being bothaspheric. Both the object-side surface 1151 and the image-side surface1152 of the fourth lens element 1150 have at least one inflection point.

The filter 1160 is made of glass material and located between the fifthlens element 1150 and the image surface 1170, and will not affect thefocal length of the optical imaging lens system. The image sensor 1180is disposed on or near the image surface 1170 of the optical imaginglens system.

The detailed optical data of the 11th embodiment are shown in Table 21and the aspheric surface data are shown in Table 22 below.

TABLE 21 11th Embodiment f = 10.48 mm, Fno = 2.60, HFOV = 14.9 deg.Focal Surface # Curvature Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Ape. Stop Plano −0.798 2 Lens 1 2.793 (ASP)1.642 Plastic 1.545 56.1 5.03 3 −118.779 (ASP) 0.100 4 Lens 2 −10.757(ASP) 0.350 Plastic 1.650 21.5 −4.74 5 4.373 (ASP) 0.750 6 Lens 3 3.133(ASP) 1.147 Plastic 1.660 20.4 5.82 7 14.528 (ASP) 0.318 8 Lens 4 −7.457(ASP) 0.452 Plastic 1.650 21.5 −12.4 9 −100.925 (ASP) 0.683 10 Lens 5−11.940 (ASP) 0.965 Plastic 1.559 40.4 −14.12 11 23.946 (ASP) 1.410 12Filter Plano 0.210 Glass 1.517 64.2 — 13 Plano 2.068 14 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 22 Aspheric Coefficients Surface # 2 3 4 5 6 k =  2.8570E−01−9.0000E+01  2.2880E+01 −6.5829E+00 −9.8749E−02 A4 = −2.6424E−03 2.6021E−03  3.6630E−02  3.7829E−02 −2.4803E−02 A6 = −1.7393E−03−2.2120E−03 −1.5789E−02 −9.1105E−03  3.8452E−03 A8 =  1.0152E−03 2.6920E−03  8.5342E−03  3.5219E−03 −1.0777E−03 A10 = −4.4337E−04−1.5363E−03 −3.3320E−03  6.6004E−04  2.0340E−03 A12 =  8.7790E−05 2.8361E−04  5.4095E−04 −9.7701E−04 −8.2549E−04 A14 = −7.4898E−06−1.2293E−05 −2.0229E−05  1.8308E−04  8.7567E−05 Surface # 7 8 9 10 11 k=  5.0584E+01 −5.8248E+01 −9.0000E+01 −2.7540E+00 −1.4934E+01 A4 =−6.9153E−02 −1.6129E−04  8.8939E−02 −1.0753E−02 −2.1219E−02 A6 = 3.4484E−03  2.6980E−02  1.9816E−02  1.7748E−02  3.9494E−03 A8 = 1.9235E−02 −2.8114E−02 −2.2144E−02 −2.4147E−02 −2.2284E−03 A10 =−1.1320E−02  2.1469E−02  5.5771E−03  1.9960E−02  9.3755E−04 A12 = 2.5213E−03 −1.3612E−02 −3.2832E−03 −9.1361E−03 −2.3047E−04 A14 =−2.0791E−04  4.3378E−03  1.9273E−03  2.1949E−03  2.7898E−05 A16 = —−5.0510E−04 −3.3685E−04 −2.0992E−04 −1.1351E−06

In the 11th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 11th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 21 and Table 22as the following values and satisfy the following conditions:

11th Embodiment f [mm] 10.48 |R9/R8| 0.12 Fno 2.60 |(R9 + R10)/(R9 −R10)| 0.33 HFOV [deg.] 14.9 [(R5 − R6)*f]/(R5*R6) −2.62 tan(HFOV) 0.27SD/TD 0.88 V3 20.4 Y52*2/EPD 0.98 (V2 + V4)/2 21.47 Y52/Y11 0.98 V2 +V3 + V4 63.3 f/f3 1.80 CT5/T23 1.29 ImgH/f 0.27 CT4/T34 1.42 TL/f 0.96T34/T12 3.18 P2 + P4 + P5 −3.80 (T23 − T45)/ 0.05 (P2 + P4 + P5)/P4 4.50(T23 + T45) |DsR5/DsR6| 0.64 ΣAT/CT3 1.61 Ymax [mm] 2.02 ΣAT/(T23 + BL)0.42 — — BL/ΣAT 2.00

12th Embodiment

FIG. 23 is a schematic view of an image capturing unit according to the12th embodiment of the present disclosure. FIG. 24 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 12thembodiment. In FIG. 23 , the image capturing unit includes the opticalimaging lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 1180. The optical imaging lens systemincludes, in order from an object side to an image side, an aperturestop 1200, a first lens element 1210, a second lens element 1220, athird lens element 1230, a stop 1201, a fourth lens element 1240, afifth lens element 1250, a filter 1260 and an image surface 1270. Theoptical imaging lens system includes five lens elements (1210, 1220,1230, 1240 and 1250) with no additional lens element disposed betweenthe first lens element 1210 and the fifth lens element 1250.

The first lens element 1210 with positive refractive power has anobject-side surface 1211 being convex in a paraxial region thereof andan image-side surface 1212 being convex in a paraxial region thereof.The first lens element 1210 is made of plastic material and has theobject-side surface 1211 and the image-side surface 1212 being bothaspheric.

The second lens element 1220 with negative refractive power has anobject-side surface 1221 being concave in a paraxial region thereof andan image-side surface 1222 being concave in a paraxial region thereof.The second lens element 1220 is made of plastic material and has theobject-side surface 1221 and the image-side surface 1222 being bothaspheric.

The third lens element 1230 with positive refractive power has anobject-side surface 1231 being convex in a paraxial region thereof andan image-side surface 1232 being convex in a paraxial region thereof.The third lens element 1230 is made of plastic material and has theobject-side surface 1231 and the image-side surface 1232 being bothaspheric.

The fourth lens element 1240 with negative refractive power has anobject-side surface 1241 being concave in a paraxial region thereof andan image-side surface 1242 being convex in a paraxial region thereof.The fourth lens element 1240 is made of plastic material and has theobject-side surface 1241 and the image-side surface 1242 being bothaspheric. The image-side surface 1242 of the fourth lens element 1240has at least one inflection point.

The fifth lens element 1250 with negative refractive power has anobject-side surface 1251 being concave in a paraxial region thereof andan image-side surface 1252 being concave in a paraxial region thereof.The fifth lens element 1250 is made of plastic material and has theobject-side surface 1251 and the image-side surface 1252 being bothaspheric. The image-side surface 1252 of the fourth lens element 1250has at least one inflection point.

The filter 1260 is made of glass material and located between the fifthlens element 1250 and the image surface 1270, and will not affect thefocal length of the optical imaging lens system. The image sensor 1280is disposed on or near the image surface 1270 of the optical imaginglens system.

The detailed optical data of the 12th embodiment are shown in Table 23and the aspheric surface data are shown in Table 24 below.

TABLE 23 12th Embodiment f = 11.20 mm, Fno = 3.05, HFOV = 14.6 deg.Focal Surface # Curvature Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Ape. Stop Plano −0.515 2 Lens 1 3.117 (ASP)1.797 Plastic 1.545 56.1 4.31 3 −7.595 (ASP) 0.091 4 Lens 2 −4.133 (ASP)0.400 Plastic 1.639 23.5 −3.29 5 4.427 (ASP) 0.592 6 Lens 3 3.431 (ASP)1.730 Plastic 1.661 20.3 4.75 7 −29.602 (ASP) 0.100 8 Stop Plano 0.397 9Lens 4 −5.474 (ASP) 0.400 Plastic 1.661 20.3 −17.22 10 −10.858 (ASP)0.403 11 Lens 5 −28.112 (ASP) 0.416 Plastic 1.584 28.2 −10.34 12 7.735(ASP) 1.500 13 Filter Plano 0.210 Glass 1.517 64.2 — 14 Plano 2.891 15Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 1201 (Surface 8) is 1.462 mm.

TABLE 24 Aspheric Coefficients Surface # 2 3 4 5 6 k =  1.4200E−01 1.1232E+01 −7.3954E+00 −2.1248E+01  2.2035E+00 A4 = −2.7752E−03 4.4174E−02  5.9992E−02  4.2334E−02 −3.1541E−02 A6 = −4.4477E−04−3.3846E−02 −4.2850E−02 −8.1557E−03  9.8372E−03 A8 = −2.9740E−04 1.3921E−02  1.9032E−02  5.5814E−05 −3.9765E−03 A10 =  7.9753E−05−3.3678E−03 −5.1143E−03  2.6845E−03  1.3675E−03 A12 = −1.5365E−05 3.6462E−04  5.9261E−04 −1.4587E−03 −2.6545E−04 A14 = — — —  2.3195E−04 2.3058E−06 Surface # 7 9 10 11 12 k = −9.9000E+01  7.9758E+00−5.9177E+01 −1.0525E+01 −1.5077E+01 A4 = −4.0984E−02  6.2113E−03 5.5090E−02 −4.7559E−02 −7.0788E−02 A6 =  6.8920E−03 −9.6191E−03−1.3369E−02  8.3095E−03  2.4295E−02 A8 =  3.0414E−03  1.6246E−02 1.6459E−02  8.8778E−03 −7.9708E−03 A10 = −1.1585E−03 −9.6065E−03−1.1937E−02 −8.5198E−03  1.4076E−03 A12 =  8.3120E−05  2.0560E−03 3.2755E−03  2.8986E−03 −1.3844E−04 A14 = — −1.5047E−04 −3.1772E−04−3.7842E−04  6.0067E−06

In the 12th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 12th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 23 and Table 24as the following values and satisfy the following conditions:

12th Embodiment f [mm] 11.20 |R9/R8| 2.59 Fno 3.05 |(R9 + R10)/(R9 −R10)| 0.57 HFOV [deg.] 14.6 [(R5 − R6)*f]/(R5*R6) −3.64 tan(HFOV) 0.26SD/TD 0.92 V3 20.3 Y52*2/EPD 0.92 (V2 + V4)/2 21.92 Y52/Y11 0.92 V2 +V3 + V4 64.2 f/f3 2.36 CT5/T23 0.70 ImgH/f 0.26 CT4/T34 0.80 TL/f 0.98T34/T12 5.46 P2 + P4 + P5 −5.14 (T23 − T45)/ 0.19 (P2 + P4 + P5)/P4 7.91(T23 + T45) |DsR5/DsR6| 0.58 ΣAT/CT3 0.92 Ymax [mm] 1.84 ΣAT/(T23 + BL)0.30 — — BL/ΣAT 2.91

13th Embodiment

FIG. 25 is a perspective view of an image capturing unit according tothe 13th embodiment of the present disclosure. In this embodiment, animage capturing unit 10 is a camera module including a camera shot 11, adriving device 12, an image sensor 13 and an image stabilization module14. The camera shot 11 includes the optical imaging lens systemdisclosed in the first embodiment, a barrel and a holder member (theirreference numerals are omitted) for holding the optical imaging lenssystem. The external light converges into the camera shot 11 of theimage capturing unit 10 to generate an image, and the camera shot 11 issupported by the driving device 12 to focus the image on the imagesensor 13, and the image is then digitally transmitted to an electroniccomponent.

The driving device 12 can have auto focus function, and the drivingdevice 12 may include voice coil motors (VCM), micro electro-mechanicalsystems (MEMS), piezoelectric systems or shape memory alloys. Thedriving device 12 is favorable for the optical imaging lens system toobtain a better imaging position, so that a clear image of the objectcan be captured by the optical imaging lens system under differentobject distances. The image sensor 13 (for example, CCD or CMOS)features high sensitivity to light and low noise, and the image sensor13 can be disposed on the image surface of the optical imaging lenssystem to provide higher image quality.

The image stabilization module 14, such as an accelerometer, a gyroscopeand a Hall sensor, is configured to work with the driving device 12 toprovide optical image stabilization (OIS). The driving device 12 workingwith the image stabilization module 14 is favorable for compensating forpan and tilt of the lens unit 11 to reduce blurring associated withmotion during exposure. In some cases, the driving device 12 can beassisted by electronic image stabilization (EIS) with image processingsoftware, thereby improving image quality while in motion or low-lightcondition.

14th Embodiment

FIG. 26 is a perspective view of an electronic device according to the14th embodiment of the present disclosure. FIG. 27 is anotherperspective view of the electronic device in FIG. 26 . FIG. 28 is ablock diagram of the electronic device in FIG. 26 . In this embodiment,an electronic device 20 is a smart phone including the image capturingunit 10 disclosed in the 13th embodiment, a flash module 21, a focusassist module 22, an image signal processor 23, an user interface 24 andan image software processor 25. In this embodiment, there is one imagecapturing unit 10 installed on the electronic device 20, and thedisclosure is not limited thereto. The electronic device 20 can includemultiple image capturing units.

When a user interacts with the user interface 24 to capture images of anobject 26, light being converged into the image capturing unit 10 togenerate image, and the flash module 21 is activated for supplyingadditional needed light. The focus assist module 22 detects the distanceto the object 26 to achieve fast auto focusing. The image signalprocessor 23 is configured to optimize image quality of the capturedimage. The light beam emitted from the focus assist module 22 can beeither infrared light or laser. The user interface 24 can be a touchscreen or a shutter button, and it can activate the image softwareprocessor 25 having multiple functions for image capturing and imageprocessing.

The smart phone in this embodiment is only exemplary for showing theimage capturing unit 10 of the present disclosure installed in anelectronic device, and the present disclosure is not limited thereto.The image capturing unit 10 can be optionally applied to optical systemswith a movable focus. Furthermore, the optical imaging lens system ofthe image capturing unit 10 is featured with good capability inaberration corrections and high image quality, and can be applied to 3D(three-dimensional) image capturing applications, in products, such asdigital cameras, mobile devices, digital tablets, wearable devices,smart televisions, network surveillance devices, vehicle backup cameras,dashboard cameras, motion sensing input devices and other electronicimaging devices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-24 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An optical imaging lens system comprising fivelens elements, the five lens elements being, in order from an objectside to an image side, a first lens element, a second lens element, athird lens element, a fourth lens element and a fifth lens element;wherein each of the five lens elements has an object-side surface facingtoward the object side and an image-side surface facing toward the imageside, and the object-side surface of the first lens element is convex ina paraxial region thereof; wherein an Abbe number of the second lenselement is V2, an Abbe number of the third lens element is V3, an Abbenumber of the fourth lens element is V4, a refractive power of thesecond lens element is P2, a refractive power of the fourth lens elementis P4, a refractive power of the fifth lens element is P5, and thefollowing conditions are satisfied:30.0<V2+V3+V4<95.0;P2+P4+P5<−3.20; and10.0<V3<25.0.
 2. The optical imaging lens system of claim 1, wherein theobject-side surface of the third lens element is convex in a paraxialregion thereof, and the image-side surface of the third lens element isconcave in a paraxial region thereof.
 3. The optical imaging lens systemof claim 1, wherein the image-side surface of the first lens element isconvex in a paraxial region thereof, and the image-side surface of thesecond lens element is concave in a paraxial region thereof.
 4. Theoptical imaging lens system of claim 1, wherein a maximum effectiveradius among all surfaces of the five lens elements of the opticalimaging lens system is Ymax, and the following condition is satisfied:1.0 mm<Y max<3.0 mm.
 5. The optical imaging lens system of claim 1,wherein the Abbe number of the third lens element is V3, and thefollowing condition is satisfied:10.0<V3≤20.4.
 6. The optical imaging lens system of claim 1, wherein afocal length of the optical imaging lens system is f, a focal length ofthe third lens element is f3, a central thickness of the fourth lenselement is CT4, an axial distance between the third lens element and thefourth lens element is T34, and the following conditions are satisfied:1.0<f/f3<5.0; and0.65<CT4/T34<9.0.
 7. The optical imaging lens system of claim 1, whereina sum of axial distances between each of adjacent lens elements of theoptical imaging lens system is ΣAT, a central thickness of the thirdlens element is CT3, and the following condition is satisfied:1.45≤ΣAT/CT3<7.50.
 8. The optical imaging lens system of claim 1,wherein a central thickness of the fifth lens element is CT5, an axialdistance between the second lens element and the third lens element isT23, and the following condition is satisfied:0.05<CT5/T23≤1.66.
 9. The optical imaging lens system of claim 1,wherein the refractive power of the second lens element is P2, therefractive power of the fourth lens element is P4, the refractive powerof the fifth lens element is P5, and the following condition issatisfied:1.10<(P2+P4+P5)/P4≤3.96.
 10. The optical imaging lens system of claim 1,wherein an axial distance between the second lens element and the thirdlens element is T23, an axial distance between the fourth lens elementand the fifth lens element is T45, and the following condition issatisfied:−0.35<(T23−T45)/(T23+T45)<0.50.
 11. The optical imaging lens system ofclaim 1, wherein a focal length of the optical imaging lens system is f,a curvature radius of the object-side surface of the third lens elementis R5, and a curvature radius of the image-side surface of the thirdlens element is R6, the following condition is satisfied:−5.48[(R5−R6)*f]/(R5*R6)<−1.70.
 12. The optical imaging lens system ofclaim 1, wherein each of the five lens elements of the optical imaginglens system is a single and non-cemented lens element, a maximum imageheight of the optical imaging lens system is ImgH, a focal length of theoptical imaging lens system is f, and the following condition issatisfied:0.10<ImgH/f<0.50.
 13. The optical imaging lens system of claim 1,further comprising an aperture stop, wherein an axial distance betweenthe aperture stop and the image-side surface of the fifth lens elementis SD, an axial distance between the object-side surface of the firstlens element and the image-side surface of the fifth lens element is TD,a maximum effective radius of the image-side surface of the fifth lenselement is Y52, an entrance pupil diameter of the optical imaging lenssystem is EPD, and the following conditions are satisfied:0.70<SD/TD<1.0; and0.70<Y52*2/EPD<1.20.
 14. The optical imaging lens system of claim 1,wherein an axial distance between the second lens element and the thirdlens element is T23, an axial distance between the fourth lens elementand the fifth lens element is T45; T23 and T45 are both larger thanother axial distances between each of adjacent lens elements of theoptical imaging lens system.
 15. The optical imaging lens system ofclaim 1, wherein a central thickness of the first lens element is themaximum among all central thicknesses of the five lens elements.
 16. Animage capturing unit, comprising: the optical imaging lens system ofclaim 1; a reflector; and an image sensor disposed on an image surfaceof the optical imaging lens system.
 17. An electronic device,comprising: the image capturing unit of claim
 16. 18. An optical imaginglens system comprising five lens elements, the five lens elements being,in order from an object side to an image side, a first lens element, asecond lens element, a third lens element, a fourth lens element and afifth lens element; wherein each of the five lens elements has anobject-side surface facing toward the object side and an image-sidesurface facing toward the image side, the first lens element haspositive refractive power, the third lens element has positiverefractive power, and the fourth lens element has negative refractivepower; wherein an Abbe number of the second lens element is V2, an Abbenumber of the third lens element is V3, an Abbe number of the fourthlens element is V4, an axial distance between the object-side surface ofthe first lens element and an image surface is TL, a focal length of theoptical imaging lens system is f, half of a maximum field of view of theoptical imaging lens system is HFOV, and the following conditions aresatisfied:30.0<V2+V3+V4<95.0;0.70<TL/f<1.10; andtan(HFOV)<0.30.
 19. The optical imaging lens system of claim 18, whereinthe second lens element has negative refractive power, and theimage-side of the fourth lens element is concave in a paraxial regionthereof.
 20. The optical imaging lens system of claim 18, wherein anaxial distance between the first lens element and the second lenselement is T12, an axial distance between the third lens element and thefourth lens element is T34, and the following condition is satisfied:0.75<T34/T12<5.80.
 21. The optical imaging lens system of claim 18,wherein a curvature radius of the image-side surface of the fourth lenselement is R8, a curvature radius of the object-side surface of thefifth lens element is R9, and the following condition is satisfied:|R9/R8|≤2.59.
 22. The optical imaging lens system of claim 18, wherein amaximum effective radius among all surfaces of the five lens elements ofthe optical imaging lens system is Ymax, and the following condition issatisfied:1.0 mm<Y max<3.0 mm.
 23. The optical imaging lens system of claim 18,further comprising an aperture stop disposed at an object side of thethird lens element.
 24. The optical imaging lens system of claim 18,wherein a curvature radius of the object-side surface of the fifth lenselement and a curvature radius of the image-side surface of the fifthlens element have the same sign.